Which is an example of an epidemic? a) whooping cough b) obesity c) black death d) spanish flu

C is the answer to this question 

C) Black Death it's was considered the worst epidemic the world has ever had, and also I searched this on google lol

Major sources of stress, such as a death or divorce, problems in family relationships, job loss, school, and substance abuse, can trigger or aggravate some mental disorders in some people. but not everyone who goes through those things develops a mental illness